Browsing by Author "Warwick, C."

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    Conductance based sensing and analysis of soluble phosphates in wastewater
    (Elsevier Science B.V., Amsterdam., 2014-02-15T00:00:00Z) Warwick, C.; Guerreiro, Antonio R.; Gomez-Caballero, Alberto; Wood, Elizabeth; Kitson, James; Robinson, James; Soares, Ana
    The current standard method used for measuring soluble phosphate in environmental water samples is based on a colourimetric approach, developed in the early 1960s. In order to provide an alternative, label free sensing solution, a molecularly imprinted polymer (MIP) was designed to function as a phosphate receptor. A combination of functional monomer (N-allylthiourea), cross-linker and monomer/template ratios were optimised in order to maximise the binding capacity for phosphate. When produced in membrane format, the MIP's ability to produce a reversible change in conductance in the presence of phosphate was explored for fabrication of a sensor which was able to selectively detect the presence of phosphate compared to sulphate, nitrate and chloride. In wastewater samples the sensor had a limit of detection of 0.16 mg P/l, and a linear range between 0.66 and 8 mg P/l. This is below the minimum monitoring level (1 mg P/l) as required by current legislation for wastewater discharges, making the sensor as developed promising for direct quantification of phosphate in environmental monitoring applications.
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    Sustainable water resources: A framework for assessing adaptation options in the rural sector. 
    (2005-11-01T00:00:00Z) Weatherhead, E. K.; Knox, Jerry W.; de Vries, T. T.; Ramsden, S.; Gibbons, J.; Arnell, N. W.; Odoni, N.; Hiscock, K.; Sandhu, C.; Saich, A.; Conway, D.; Warwick, C.; Bharwani, S.; Hossell, J.; Clemence, B.
    Abstract.  This project developed a framework to assess how the irrigated agriculture and turf grass leisure sectors in England could adapt to climate change impacts on water resources. Two catchments (the Nar and Wensum) in East Anglia provided case studies for hydrological, crop yield and land-use modelling; farmer interviews were held across East Anglia, and the golf sector study covered England and Wales. Future climate scenarios were developed from the UKCIP02 dataset, using the high and low emission scenarios for the 2020s and 2050s. For all these scenarios, hydrological modelling showed, even by the 2020s, groundwater recharge is reduced, ground water levels are lower, and both summer and winter river flows fall despite higher winter rainfall. These changes imply major reductions in water available for abstraction and its reliability. It would be impossible to meet the current environmental river flow objectives even without abstraction. Crop yield and land use modelling suggested that farmers will still grow high value irrigated crops such as potatoes and field- scale vegetables. If water resources are limited, they will reduce irrigation of other crops and invest in farm reservoirs, using winter abstraction. However, the extra costs will reduce farm net margins, and make farm businesses more vulnerable. Farmer interviews confirmed that cropping changes and reservoirs are the preferred adaptations. A prototype knowledge elicitation tool was developed to improve understanding of farmer behaviour. A survey of golf course irrigation in England and Wales revealed courses are about equally split between using mains water and direct abstraction. If water is limited, many could adapt by restricting irrigation to greens and tees; others could use reservoirs, re-use and water harvesting. However, client/member pressure is for fully irrigated surfaces. Overall, the study revealed that adaptations options do exist, albeit with costs. Better information on the climate impacts and careful regulation would reduce the risks of users adopting individual adaptations that are not optimal overall and/or inappropriate.